| Acknowledgements | 第1-5页 |
| Abstract | 第5-8页 |
| 摘要 | 第8-10页 |
| Contents | 第10-12页 |
| List of Tables | 第12-13页 |
| Chapter One Introduction | 第13-17页 |
| ·Research Background | 第13-14页 |
| ·Necessity and Significance of the Study | 第14-15页 |
| ·Organization of the Thesis | 第15-17页 |
| Chapter Two Literature Review | 第17-33页 |
| ·An Introduction to Discourse Markers | 第17-27页 |
| ·Terminology for Discourse Markers | 第17-18页 |
| ·Definitions of Discourse Markers | 第18-19页 |
| ·Features of Disscourse Markers | 第19-21页 |
| ·Classifications of Discourse Markers | 第21-24页 |
| ·Functions of Discourse Markers | 第24-27页 |
| ·An Overview of Studies of Contrastive Discourse Markers | 第27-28页 |
| ·An Overview of Studies of CDMs Abroad | 第27-28页 |
| ·An Overview of Studies of CDMs at home | 第28页 |
| ·An Overview of Studies of Discourse Markers but | 第28-32页 |
| ·Studies on Discourse Marker but Abroad | 第28-31页 |
| ·Studies on Discourse Marker but Home | 第31-32页 |
| ·Originality of the Study | 第32-33页 |
| Chapter Three Research Design | 第33-37页 |
| ·Research Questions | 第33页 |
| ·Data Collection | 第33-35页 |
| ·Corpora and Instrument | 第33-35页 |
| ·Procedures of Analysis | 第35-36页 |
| ·Summary | 第36-37页 |
| Chapter Four Data Analysis and Discussion | 第37-51页 |
| ·Results of Data Analysis | 第37-45页 |
| ·Overall Frequencies of but in SWECCL and BNC | 第37-38页 |
| ·Syntactic Positions of but in SWECCL and BNC | 第38-40页 |
| ·Collocations of but in SWECCL | 第40-42页 |
| ·Pragmatic Functions of but in SWECCL and BNC | 第42-45页 |
| ·Discussion | 第45-48页 |
| ·Similarities in the Use of but in SWECCL and BNC | 第46页 |
| ·Differences in the Use of but in SWECCL and BNC | 第46-48页 |
| ·Possible Factors Contributing to the Inappropriate Use of but | 第48-50页 |
| ·Language Proficiency | 第48-49页 |
| ·Pragmatic Fossilization | 第49页 |
| ·Negative Transfer | 第49-50页 |
| ·Summary | 第50-51页 |
| Chapter Five Conclusion | 第51-55页 |
| ·Major Findings of the study | 第51-52页 |
| ·Implications of the Study | 第52-53页 |
| ·Limitations | 第53-54页 |
| ·Suggestions for the Further Studies | 第54-55页 |
| Works Cited | 第55-57页 |
